<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    
</body>
<script>
let conf = {
    useValidate: true,
    formModel: 'form',
    formRules: 'rules'
}

let child = `<el-form-item label="" props="">
    </el-form-item>`
let str = `<el-form${conf.useValidate? ` :model="${conf.formModel}" :rules="${conf.formRules}"`: ``}>
    ${child}
</el-form$>`;
console.log(str)
</script>
</html>